linux-kernel - Re: [Xen-devel] [PATCH v7 5/9] PCI: Add pci_iomap

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Message-ID: <CAB=NE6XrpUYBnu05NL2+Te2e5Kmc39DQWptRWRDMfGD9ygOWKw@mail.gmail.com>
Date:	Fri, 26 Jun 2015 18:16:08 -0700
From:	"Luis R. Rodriguez" <mcgrof@...e.com>
To:	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	Russell King <linux@....linux.org.uk>,
	Stefano Stabellini <stefano.stabellini@...citrix.com>
Cc:	linux-fbdev <linux-fbdev@...r.kernel.org>,
	"Michael S. Tsirkin" <mst@...hat.com>,
	"linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	Jan Beulich <jbeulich@...e.com>,
	Ville Syrjälä <ville.syrjala@...ux.intel.com>,
	"xen-devel@...ts.xensource.com" <xen-devel@...ts.xensource.com>,
	Arnd Bergmann <arnd@...db.de>,
	Tomi Valkeinen <tomi.valkeinen@...com>,
	Daniel Vetter <daniel.vetter@...ll.ch>,
	Dave Airlie <airlied@...hat.com>, Ingo Molnar <mingo@...e.hu>,
	Jean-Christophe Plagniol-Villard <plagnioj@...osoft.com>,
	Casey Leedom <leedom@...lsio.com>,
	Antonino Daplas <adaplas@...il.com>,
	Suresh Siddha <sbsiddha@...il.com>,
	Stefan Bader <stefan.bader@...onical.com>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Juergen Gross <jgross@...e.com>,
	Toshi Kani <toshi.kani@...com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	Andy Lutomirski <luto@...capital.net>,
	David Vrabel <david.vrabel@...rix.com>,
	"venkatesh.pallipadi@...el.com" <venkatesh.pallipadi@...el.com>,
	Roger Pau Monné <roger.pau@...rix.com>
Subject: Re: [Xen-devel] [PATCH v7 5/9] PCI: Add pci_iomap_wc() variants

On Fri, Jun 26, 2015 at 4:54 PM, Benjamin Herrenschmidt
<benh@...nel.crashing.org> wrote:
> On Fri, 2015-06-26 at 15:41 -0700, Luis R. Rodriguez wrote:
>
>> > It wasn't nullified for the main user at the time, the fb. And I
>> > mentioned an IB adapter or two for which the code had been hand
>> tuned.
>>
>> This still means there could be some affected drivers when used on
>> powerpc, no?
>
> Yes. In fact what about things like ARM who also have barriers in their
> writel() ? Won't they also break WC ?

Not sure if they have that write-combine notion on their CPUs /
interconnects. Russel, Stefano, does ARM have write-combining ?

 Luis
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